From what I've been able to tell from various google searches,it might be an interaction with other shell extensions that youhave installed or possibly a virus -- there were lots of notesabout that. Or it could be something that I did (or didn't do).

Perhaps you could collect a little information for me.

On the "Windows Explorer has encountered a problem..." dialog, clickon the "To see what data this error report contains. click here."and tell me the "Error signature" details. there should be 5 items there.